Liquid pump



, April 12,1932. L E 1,853,767

LIQUID PUMP Filed Aug. 8, 1930 Patented Apr. 12, 1932 UNITED STATES PATENT ounce RAYMOND LESLIE KENT, OF LOWER PENN, ENGLAND, ASSIGNOR OF t JNE-THI RD TO MORRIS INDUSTRIES LIMITED, OF. OXFORD, ENGLAND, AND ONE-THIRD TO THOMAS CARLYLE SKINNER, OF BIRMINGHAM, ENGLAND LIQUID rum]? Application filed August 8, 1930, Serial No. 473,974rand in Great Britain December 24, 1929.

This invention has for its object to provide an improved fuel pump for internal combustion engines employing petrol or other llke fuel, the pump being used for supplying fuel automatically from a main tank to the carbureter float chamber or other small container.

The invention comprises a pair of pistons arranged in separate cylindrical chambers, one of the pistons being arranged to act on the petrol or other liquid fuel, and the other to be operated in one direction by oil supplied by the lubricating oil pump, a spring or springs acting on one or each of the pistons, and a valve in the operating piston whereby the oil pressure acting on one of its surfaces can be intermittently neutralized.

In the accompanying drawings, Figure 1 illustrates in section a petrol or like fuel pump constructed in accordance with this invention.

Figure 2 shows diagrammatically the pump illustrated in Figure 1, in combination with a lubricating oil pump, and fuel tank and carbureter.

Referring to the drawings, a cylinder at is divided by a partition 6 into two chambers c, d. The chamber 0 is connected by a pipe 6 to the main fuel supply tank f, and by a pipe 9 (which is controlled by a non-return valve h) to the carbureter float chamber 2 or other small container to be supplied with fuel. Also the chamber 0 contains a pump piston i which can be moved in one direction by a spring y. The spring is carried at one end on a perforated support k. Apertures Z in the piston allow the liquid to flow through the piston, and these apertures are controlled by a valve ring m.

The other chamber 03 is connected by a pipe n with the pump 0 by which lubricating oil is supplied to the various parts of the engine. The return flow of oil from the chamber cl to the oil tank p or to any other part of the 5 a spring it supported on a ring o. 7 The pipe 42 communicates with the upper side of the piston r through a passage w, and the pipe Q communicates with the under side of the piston 1 through a pair of adjacent passages 7 Starting with the mechanism in the position shown in the drawings, lubricating oil from the pump 0 acts'on the upper side of the piston 'r' and valve .9 and moves them together in the downwardidirection against the action of the spring 14-. By this'moveinent of parts, the piston 15 is caused to descend against the action of the spring y, and petrol or the like is caused to flow to the upper side of the piston z through the valve m. When the piston 1* reaches the ring 4) its movementis ar rested, and thereupon the pressure acting'on the upper side of the valve 8 causes the Valve to continue its motion sulficiently to allow oil to flow past the valve from the upper tothe lower side of the piston, In this-position the passage w is closed-by the piston 7, butthe passage y is-open, and consequently oil can Wards under the action;v of the spring j, following the movement of the piston 'r', and a quantity of liquid fuel is displaced from the chamber 0 through the valve Z) to the pipe 9. When the piston 1 reaches the upper end of its movement, the valve 8 closes the aperture in the said piston, and the cycle of operations is then repeated.

When the pressure of liquid in the pipe 9 exceeds that of the spring 7', due to the fact that no further liquid can pass into the container e supplied by the pump, the action of the mechanism ceases, but the action is automatically resumed when the liquid can again flow freely into the pipe 9.

By this invention the automatic supply of liquid fuel from the main tank to the carbureter or the like is maintained in an effective manner, and the means employed ensure the necessary reliability. Vhen the engine stops. the lubricating oilpump 0' also stops, and no further fuel is supplied until after the engine has been re-started.

Whilst, in the drawings, I have shown the chamber 03 connected directly to the oil pump 0, it will be understood that the connection may be made to any convenient part of the lubricating oil supply system of the engine.

Having thus described my invention what I claim as new and desire to secure by Let-- ters Patent is 1. In fluid operated fuel pumps for internal combustion engines, the combination of a cylindrical pump chamber, a cylindrical operating chamber coaxial with the pump chamber, a piston in the pump chamber, a non return valve on the said piston, an annular piston in the operating" chamber, a Valve disc co-operating with the said annular piston, arod connectingthe pump piston with the valve disc in the operating chamber, a spring; in each chamber acting on the piston i'n: that chamber, inlet and outlet passages for each chamber, a spring supporting ring in: the operating chamber, and outlet ports common to: the outlet passage and opening into-the operating chamber at opposite sides of the said ring, substantially as described;

2'; In fluid operated fuel pumps for internal combustion engines, the combination of a: cylindrical pump chamber, a cylindrical operating chamber coaxial with the pump chamber, a pistonin the pump chamber, a non-return valve-- on the said piston, a piston in the operatingchamber', a valve co-operatingwith the operating piston, a rod connecting the pump piston with the valve of the operating piston, a spring in each chamber acting on the piston in that chamber, and inlet and outlet passages for each chamber, substantially as described.

In testimony whereof I have signed my name to this specification.

RAYMOND LESLIE KENT. 

